Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8dcb72fc9887ed…

MALICIOUS

PDF

81.0 KB Created: 2021-07-02 10:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab8408eb51cef7e0faf051864e2922c2 SHA-1: 21b275c434feaa11b88e04096a1d719ee9bbb867 SHA-256: 5f8dcb72fc9887edd4fd17930d69d87973d1b6133b6f71828f43a527dbda364a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=fusion+360+cookie+cutter+tutorial PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/28b633edbb0bdd25dee6ce5fc58b1721/kuriwagefesumazu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/e15a341dec2ca02d91e248636c5befec/5347217282.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/67480059453.pdfIn PDF document text
    • http://szwygs.com/upload/45065642403.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/zujufikupaxazejarozoda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ebab9a27---41247569112.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/65396e88828985c340a7cd95092e0fe3/36940280023.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad75851e14---17576246833.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/66165370935.pdfIn PDF document text
    • https://songhong.info/userfiles/file/tepex.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/39850058482.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/66653947305.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa36f184e---45559925691.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/zevusezovurizoje.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fabobabo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099887911863---riguzuloxusutagapat.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b5d991679---wodusabukiraxule.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc137a8544---somukuj.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f637ef171---bopojapuwuk.pdfIn PDF document text
    • http://axwelindia.com/uploads/7908903448.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5ba83f2561ca82d71950109e5e63835a/83380279701.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/38364458683.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55a51c5b2---segexukodepevowasute.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB699 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_01_sfnt_off0000c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 16136 bytes
SHA-256: e9391c5bd5b2ba203c6589927482663a9464624f4d85d8e355eaca7d1baf600b
font_02_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 17636 bytes
SHA-256: 139b1374d933b4a2c9dabf3417aa2bd8b7e615556c2ee260e30d1da3242deb68
font_03_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 10856 bytes
SHA-256: 94fe293edc4279fc1395be3453dfc374dd4a575e2080d8f11a6129a7a62d8b2f

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